If + present tense, for talking about facts, If + future tense, for talking about likely situations, If + past (+ would/might), for talking about unreal or imaginary situations, If + past perfect (+ would/might have +past), for talking about regrets or when we feel relief, If + past perfect (+ would /could/might have been), to talk about things that are no longer possible because of what has already happened.

Conditionals

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